Work holding clamp



Aug. 25, 1931. L. LEYES WORK HOLDING CLAMP Filed Jan. 20, 1950 INVENTORLOUI5 LEY ES h is ATTORNEYS Patented Aug. 25, 1931 UNITED smras PATENTOFFICE LOUIS Lmrasor cm Ismn, new roan WORK HOLDING CLAMP Applicationfled January 20, 1980. Serial No. #22 079.

lustrative embodiments ofthe invention shown in the annexed drawings.

In the drawings: I Fi 1 is a sectional view on the line 1:-1 of Fig. 2,showing the clamping means In operative work-ho ding position; I Fig. 2a section on the line 22 of Fig, 1; Fig. 3 a view similar to Fig. 2,show ng the adjustable and removable work-holdm means positioned forlifting out of the wor table slot; and v Fig. 4 a view showing aslightly modified construction. j

Referring to the drawings by reference 26 characters, 10 is a supportsuch as the usual work table of amachine tool having its flatwork-engaging face 11 provided with the usual T-slots or undercutgrooves 12, one of which is shown. The work or article clamped Soto face11 is indicated at 13, and it will be understood that it may be held totable 10 by as many of the improved adjustable and detachable clampingdevices as desired, only.

one of these devices being shown.

36 The adjustable and detachable clamping device comprises an adjustablepost-carrier or slide 14 engaged in the wider-or bottom portion of slot12, a post 15 attached at one end to the slide and having its other endprovided with an external scr'ew thread, and a work-engaging clampingnut 16 threaded on the last mentioned end of the post. The axial line ofthe post passes through the elongated mainflat body'portion of the slideat a point i 5 midway between the ends of said portion and also midwaybetween the sides ofsaid portion. v

The post rises vertically from the centrally located raisedportion orboss '14" of the slide 14, which raised portion --is engaged in thenarrower or mouth portion of slot 12. Post 15 may be formed into rallywith the slide, as in the construction s own in Fig. 4 or its lower endmay be threaded into the slide as shown inthe embodiment illustrated inFigs. 1, 2, and 3, or attached in any other manner to the slide to movetherewit I The mainelongated portion of the slide or head for the post15 has a flat top and bottom and is of slightly less thickness from topto bottom than the depth of the wider ortionv of slot 12. It also hasfiat parallel si e faces 17 connected b rounded end faces 18, the widthof said e ongated portion of the slide being slightly less than that of.the narrower portion or mouth of slot 12 and the maximum I length ofsaid portion being slightly less than the width of the wider portion ofslot 12. By providing flat side faces 17 spaced as de scribed androunded end faces 18 curved about the axis of the post 15 andequidistant from said axis, as shown, the elongated portion of the headmay be passed through the mouth of the slot as shown in Fig. 3 and thenrotated through a quarter turn into the position shown in Figs. 1 and 2in which it extransversely of the slot and across substantially the fullwidth of the wider bottom portion of the slot.

The raised portion or boss 14" of the slide projects up into the narrowmouth portion tends at a right angle to the slot or directly of the slotwhen the main portion of the slide is seated in the wider portion of theslot, and said boss is preferably of such height that its upper end hesbelow the work-engaging face 11 of the table 10, as shown. Boss 14 has apair of parallel fiat side faces 19 and a second pair of parallel .flatside faces 20 extending at right angles to side faces 19 which areparallel with and in the same vertical planes as the fiat side faces 1of the elongated main portion of the slide 14. Diagonally oppositecorners of the boss 14 are each rounded off in an arc of the same radiusR struck from the axis of the post andboss, this radius be- Faces 19 and20 are tangent to a'circle having the radius B so that faces 19 willsquarely abut the op osite side walls of the mouth ofslot 12 w en theclamping nut carrier is rotated in one direction, and so that faces 20will squarely abut said side walls of theslot mouth when the carrier isrotated in the opposite direction. Faces 19 arrest rotation of thecarrier with the elongated portion of slide 14 extending directlylengthwise of the slot, so that it may be readily lifted out of theslot, while faces 20 arrest rotation of the carrier with said elongatedportiomdirectly across the slot. The flat side faces 19'of the boss alsoslidably coact with the side walls of the mouth of the slot'to slidablyguide the elongated portion out of the slot in detaching the holdingdevice from the table, while fiat side faces 20 slidably coact with saidside walls to guide the adjustable holding device during adjustmentsover the table while interlocked with the table.

The insertion, removal and adjustment of the holding device is greatlyfacilitated by the novel construction thereof shown and described, andit will be obvious that the invention provides a simple and efiicientclamping or holding device which may be readily attached to and removedfrom a slotted work table at any point along the length of a T-slot ofthe table.

What I claim is:

1. A work clamping means comprising a work-support having oppositelyfacing surface portions and a slot with parallel side walls which extendfrom one surface portion to the other, a post projecting beyond theplane of one of said surface portions and having its projecting endprovided with a screw thread, a removable and adjustable post-carryingslide having a main body portion elongated transversely of the postcoactive with the oppositely facing surface portion of the support andhaving a raised portion intermediate its ends engaged in said slot, saidraised portion having two pairs of parallel flat faces alternatelyengageable with the side walls of the slot to arrest rotation of thecarrier after a quarter turn in opposite directions at either of twopositions in one of which the elongated portion of the slide eX tendsdirectly lengthwise of the slot and in the other of which said elongatedportion extends directly crosswise of the 'slot, the maximum width ofthe elongated portion of the slide not exceeding that of the slot, andthe 'said pairs of fiat faces on the raised portion of the slide beingjoined by diagonally opposite rounded corner face portions, and a workclamping nut on said threaded end ofthe post. r a

2. A clamping means of the class set forth,

' comprising a work-holding table having an undercut groove in itswork-engaging'face, and an adjustable and detachable holding device forclamping the work to the table, said devicevcomprising an elongated headinsertable through the mouth of said groove and rotatable in theundercut portion of the groove to interlock the head with the table, anupstanding post held at one end to the head centrally of the head andexternally threaded at its upper end,,and a work-clamping nut on saidthreaded end of the post, said head having a central upstanding bossrotatable in the mouth portion of the undercut groove and-having flatside face portions coactive with the side walls of the said mouthportion of the groove to arrest rotation of the head in the undercutgroove in opposite directions in either of two positions, in one ofwhich the head is positioned for lifting out trally located boss on oneface thereof pro vided with two pairs of fiat stop faces alternativelyengageable with the side walls of a table slot, one pair of said sidefaces being located in spaced planes parallel with the longitudinalcenter line of the post carrier and the other pair being disposed inplanes spaced the same distance apart as the first mentioned planesextending crosswisely of the carrier at a right angle to thelongitudinally center line, said boss having two diagonally oppositerounded corner faces each connecting two angularly disposed ones of.

said stop faces and extending around the center of the boss through anangle of at least ninety degrees, and a post rising centrally from thecarrier at the face of the carrier from which the boss rises, said postbeing provided with an external screw thread for connection of aWork-clamping nut therewith. r

6. A work-clamping nut carrier as claimed in claim 5, wherein thenut-carrying post is screw thread coupled with the head at its lowerend.

7. An adjustable and detachable anchoring means, comprising apost-carrying head having a boss on one face thereof and spacedlongitudinally ofthe head from one end of the head, a post rising fromthe boss centrally of the boss and provided with an external screwthread beyond said boss, and a nut on thethreaded portion of the post,said boss having two pairs of parallel fiat faces connected bydiagonally opposite convex faces, one pair of said flat faces lying inplanes intersecting the planes of the other 'pair, said pairs of flatfaces being correlated with the head to position the head alternativelyto bridge and to pass through a slideway in which said boss is slidablengaged and oscillatable between limits etermined by said pairs of flatfaces.

8. In an attachin means, in combination, means formin a s ideway havingparallel side walls, an a detachable and ad ustable anchoring devicecoactive with said slideway forming means comprising a head shaped topass through said slideway in one rotatably adjusted position of thedevice and to bridge the slideway in another rotatably adjustedposition, said head having a boss normally en aged in the slidewayhaving two pairs of at faces, the faces of each pair bemg parallel andspaced apart to simultaneously abut the opposite side walls of the way.one pair of faces lying in planes intersectin the planes of the otherpair of faces, one 0 said pairs of faces being coactive with the sidewalls of the way to arrest rotation of the device with the headpositioned for passing through the way and the other air of said facesbeing coactive with said si e walls to arrest rotation of the devicewith the head signature.

LOUIS LEYES.

